Do not build chrp if the source is missing
Do not build chrp if the source is missing

chemfiles/chemfiles,lscalfi/chemfiles,lscalfi/chemfiles,chemfiles/chemfiles,chemfiles/chemfiles,lscalfi/chemfiles,Luthaf/Chemharp,lscalfi/chemfiles,Luthaf/Chemharp,chemfiles/chemfiles,Luthaf/Chemharp